Here's my current fish list in the RSR 525XL:
Copperband Butterfly(4")
Bluestar Leopard Wrasse(3")
Magma Wrasse(3")
Melanarus Wrasse(3.5")
Pintail Wrasse(3")
Midas Blenny(3")
Yellow Belly Regal Angel(4.5")
3 Evansi Anthias(2.5")
One Spot Foxface(4")
3 Neon Gobies( 1")
Whitetail Bristletooth Tang(3.5")
Purple Tang(2.5")
Pretty much in the order that they were introduced to the tank. I have had some losses and misnamed juvenile fish that I took out before ending up with this list. I am kinda close to full and still maintaining acceptable nutrients level for SPS health(~.1 Phosphate and <10 Nitrate). I had to get re-home a Blue Throat Trigger when he was eating too much and making the Yellow Belly Regal too thin.
Might re-add a Mandarin when I feel the pod population is sufficient. Had one but the Copperband, Bluestar Leopard Wrasse, Melanarus, Evansi and even the Yellow Belly Regal ate pods too and it whittled away.
Scubabum has an impressive amount of fish in the 525XL. The maxed that I got to was around 18 then stressed between a Potters Angel and my original Whitetail Bristletooth caused an ich outbreak that wiped out all but the wrasses and the Copperband.